Extension circuit-closer.



No. 796,512. I PATENTED AUC. C. 1905. I. E. HEESHEY.

EXTENSION CIRCUIT CLOSER.

APPLICATION FILED DEG. 7. 190]..

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IINITED STATES PATENT. OFFICE.

JACOB ROBERT HERSHEY, OF KEOKUK, IOWA, ASSIGNOR, BY MESN E ASSIGNMENTS, TO ELECTRICAL DEVICES COMPANY, OF KEOKUK, IOWA,

A CORPORATION OF IOWA.

EXTENSION CIRCUIT-CLOSER.

Specification of Letters Patent.

Patented Aug.r 8, 1905.

To @ZZ whom, t may concern:

Be it known that I, JACOB ROBERT HERSHEY, a citizen of the United States, residing at Keokuk, in the county of Lee and State of Iowa, have invented a certain new and useful Improvement in Extension Circuit -Closers, of which the following is a full, clear, concise, and exact description, reference being had to the accompanying drawings, forming a part of this specification.

My invention relates to a new and improved form of extension circuit-closers for use in connection with telephone subscribers instruments. It has for its objects the provision of a device of the kind described that can be readily attached to and used with any telephone instrument, that is sensitive in operation so as to readily respond to the action of the call-bell, however weak, and one that is simple in construction and inexpensive to manufacture.

To the accomplishment of the foregoing and such other objects as hereinafter appear the invention consists of an insulating-block having mounted thereon a front plate and a back plate. To the front plate the annunciator or drop which forms one terminal of the extension bell-circuit is pivoted, While between the two plates and in a recess of the block a catch lever or arm is mounted, the said lever or arm being provided with a catch adapted to normally retain the annunciator flap or drop in raised position. The long arm of the lever rests in the path of the bell-hammer and is always returned to its resting position after the operation of the bell by gravity. A stop for the drop forms the other terminal of the switch, and suitable binding-posts are electrically connected with the two switch-terminals. Means are also providedfor readily attaching the device to the box of a telephone subscribers wall set or other instrument with the said long arm of the catch lever or arm standing in the path of the call-bell clapper.

A The invention further consists in the parts and combinations of parts hereinafter described, and particularly pointed out in the appended claims.

tion of the device. Fig. 2 is a side view of the bell, showingthe relative location of the catch lever-arm and bell-tongue. Fig. 3 is a side elevation of the device. Fig. 4 is a back or rear elevation of the same. Fig. 5 is a viewl of the back of the device With the back plate removed. Fig. 6 is asectional view on the line 6 6 of Fig. 5 looking in the direction of the arrows. Fig. 7 is a section on the line 7 7, Fig. 4. Fig. 8 is a perspective View of the catch-lever.

In the figures, 2 designates an insulatingblock of any suitable material, preferably hard rubber.

3 is the front plate, while I represents theA back plate, these plates being secured together and to the block by the screws 5 5, as shown in Figs. 3, 4, 6, and 7, the apertures 6 6therefor in the block 2 being shown in Fig. 5. A metallic band 7 encircles the rear edge of the block 2 to inclosc with the rear plate, which covers the entire back of the block, the re-y cessed portions of the-block, and to presentay neat and finished appearance. Formed integrally with the backplate are suitable ears or lugs 8, through which apertures 9 9 are provided for securing-screws 10, through the or drop, 13, are adapted to work and byA which the said Hap or drop is supported. At the upper end of the plate 3 a tongue or lug 14: is bent outwardly to cause the drop 13 to normally lean outwardly a trifle, so that gravity will be sure to make the same fall when it is released. The plate 3 and flap 13 are conveniently and preferably about the same size.

A recess 15 is formed in the back of the block 2, in which the catch-lever 16 is pivoted upon a pivot-screw 17. The catch-lever comprises a long arm adapted to extend out of and to vibrate in a slot provided for the purpose in the band 7. A portion 18 extends laterally from the line of the long arm, through the end of which the pivot 17 passes, whereby the said lever tends to fall toward the right in Fig. 1, due to the force of gravity. A portion 19 extends between the said two portions of'the lever, which permits the long arm to vibrate close to the face of the support, and at the same time the screw 17 has suiiicient room within the recess. A catch 2O on the lever 16 extends forwardly throughasuitable notch in the upper edge of the block 2 and normally retains the drop in raised position. The free end of the lever-arm stands on one side of the bell tongue or lever 21, gravity tending to retain it in normal position, as shown, whereby when the bell is operated the lever is thrown to one side and the catch 20 is lifted to allow the drop 13 to fall. When the drop falls, it strikes upon the end of the screw, as in Fig. 3, and serves to complete the circuit between the two sides of the extension bell-circuit, as hereinafter explained. The screw-bolt 22 has a nut 23 sunk into the front face of the block 2 to securely hold the same, and at its head end it passes through a switch-lever 24, mountrd to vibrate in a recess in the back of the block 2, its lower end or handle projecting through a slotin the metallic band 7. 1n the position of Fig. 5 a springclip 25 presses upon the end of said switch 24, the spring 25 being held in place by one of the screws 26 26 used to secure the conducting-strip 27 in place in a channel in the block 2. The strip 27 has a notch in its edge to permit lever 16 to freely vibrate and is otfset at the end and carries a binding-post 28. A corresponding post 29 is carried upon the lug 30, formed upon .the back plate 4.

The binding-post 29 is electrically connected by the screws 5 with the front plate and drop, and post 28 is similarly connected with the screw 22 by means of strip 27, spring' 25,

and lever 24 when the latter is as shown in Fig. 5, while the two series of parts are insulated from each 'other by the block 2. The external circuit comprises the conductor 31, leading from post 28, extension bell 32, battery 33, and wire 34 to post 29, the said bell being located at any desired point.

The manner of using the device is obvious. The operation of the telephone-bell, as in calling, operates the lever 16, which releases drop 13 and allows it to fall. rlhe circuit being now closed between the drop and the screw 22, the extension-bell rings, and a signal at a distance is thus given. service is not wanted, the lever 24 may be moved out of contact with spring 25 to open the circuit therebetween. In this condition the drop alone may be used to indicate the receipt of a call. rlhe gravity-acting catchlever 16 results in a Very sensitive yet positive actuating means.

` While the invention has been described with especial attention to'detail, it is apparent that various mechanical embodiments When the extension thereof are possible, and I accordingly desire to cover all such modifications and changes as fairly fall within the scope and principle of the same. i

What I claim as new, and desire to secur by Letters Patent, is

1. The combination with an insulatingblock, of a drop mounted upon the front face of the block, a lever carrying a drop-engaging arm pivoted upon the back of said block, said lever having an extended portion disposed in gravitational engagement with the tongue or lever of a call-bell, a stop for the drop. binding-posts mounted upon said base and connected one with the stop and the other with the drop and an extension bell-circuit completed from said binding-posts, substantially as described. f

2. The combination with an insulatingblock, of a contact-plate mounted upon the front face of the block, a drop pivoted to said plate, a stop for said drop, a lever carrying a drop-engaging arm mounted upon the back of said block, means extending through said block mechanically supporting said plate in position and electrically connecting said plate with one terminal of an extension bell-circuit and means for connecting the other terminal of said circuit with said stop, substantially as described.

3. The combination with a block of insulation, a drop mounted on one side of the same, a stop-screw projecting through the block against the end of which the drop rests when it falls, a switch-lever at the back of the block pivoted upon said screw, a spring-terminal also secured on the vback of the block and adapted to bear upon one end of the lever when 4. The combination with an insulating-disk, k

of a drop mounted on the face thereof, a vibrating lever pivoted upon the rear face of said disk and having a drop-engaging catch extending forwardly to engage said drop and maintain it in raised position when the lever is quiescent, a stop for said drop, bindingposts secured to the lower face of said disk, one of said posts being electrically connected with the drop and the other with said stop, a switch mounted upon said insulating-disk and having a downwardly-extending operatinghandle, said switch being included in the circuit between said binding-posts and established by the drop in its fallen position, said binding-posts and said upwardly-extending lever being substantially in the plane of the rear face of the disk whereby the device may be neatly mounted upon a iiat support, the said device forming a self-contained structure In witness whereof I have hereunto subadapted tio be mounted upon a telephone-box scribed my name in the presence of two witbeneath a telephone call-bell with said upwardly-extending lever adjacent the Vibrating nesses.

tongue of the bell whereby when the bell is JACOB ROBERT HERSHEY. actuated the drop is released and the eXten- Witnesses:

sion bell-circuit is closed between the drop and n J. V. E. TITUS,

CORA A. LOEFFLER.

stop, substantially as described. 

